Written in 1939, this edition from 2001, trade sized paperback.
A master suspense writer; a huge influence on Alan Furst, who is my favorite historical spy/suspense author. This is not a historical novel; Eric Ambler was writing during the time when these events would have occurred, and he knew his world well. If you want a feeling for the times and attitudes that your grandparents lived with and understood, you couldn't do better than to read Ambler. He's a terrific writer.
This particular book was the basis for the classic movie "A Mask for Dimitrios"; the English writer character Latimer of the book was changed to a Hollander called Leyden so that Peter Lorre could play him. Ambler's novel has more emphasis on the political aspect of Dimitrios's activities; he was essentially a terrorist for hire. But if you've seen the movie (which I had before I read this), you know the ending, but you don't know all the ramifications of the events that preceded it.
A great detective story written before it got common-place for the innocent man to be thrust into the way of danger (a la Dan Brown).
I didn't enjoy this book as much as I thought I would. It was a good plot, but the author's writing style left me frequently confused as to what was going on. Maybe it was the difference in language style - English vs. American.